// Replace immutable empty list with mutable list.
          extras = new ArrayList<>();
        }
        extras.add(other.element);
        extras.addAll(other.extras);
        if (extras.size() > MAX_EXTRAS) {
          extras.subList(MAX_EXTRAS, extras.size()).clear();
          throw multiples(true);
        }
        return this;
      }
    }

      int minCopiesOfEachGoodQuery = numGoodQueries / size;
      int extras = numGoodQueries % size;

      for (int i = 0; i < minCopiesOfEachGoodQuery; i++) {
        queryList.addAll(elementsInSet);
      }
      List<Element> tmp = Lists.newArrayList(elementsInSet);
      Collections.shuffle(tmp, random);
      queryList.addAll(tmp.subList(0, extras));
    }

    // now add bad queries

      int minCopiesOfEachGoodQuery = numGoodQueries / size;
      int extras = numGoodQueries % size;

      for (int i = 0; i < minCopiesOfEachGoodQuery; i++) {
        queryList.addAll(elementsInSet);
      }
      List<Element> tmp = Lists.newArrayList(elementsInSet);
      Collections.shuffle(tmp, random);
      queryList.addAll(tmp.subList(0, extras));
    }

    // now add bad queries

again.  The Mock Turtle went on.

  `We had the best of educations--in fact, we went to school
every day--'

  `I'VE been to a day-school, too,' said Alice; `you needn't be
so proud as all that.'

  `With extras?' asked the Mock Turtle a little anxiously.

  `Yes,' said Alice, `we learned French and music.'

  `And washing?' said the Mock Turtle.

  `Certainly not!' said Alice indignantly.

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again.  The Mock Turtle went on.

  `We had the best of educations--in fact, we went to school
every day--'

  `I'VE been to a day-school, too,' said Alice; `you needn't be
so proud as all that.'

  `With extras?' asked the Mock Turtle a little anxiously.

  `Yes,' said Alice, `we learned French and music.'

  `And washing?' said the Mock Turtle.

  `Certainly not!' said Alice indignantly.